2. The Main Routine In these notes I call it DataImporter. It contains: A main routine the creates an instance of IndexerData, the root of our data model. It has two supplemental static methods that make our job much easier. ArrayList getChildElements(Node) String getValue(Element)

3. Setting It Up // When in conflict use the class from org.w3c.dom. // Examples: Document, Element, Node, NodeList File xmlFile = new File("Records.xml"); DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance(); DocumentBuilder dBuilder = dbFactory.newDocumentBuilder(); Document doc = dBuilder.parse(xmlFile); //Can use URI instead of xmlFile //optional, but recommended. Read this //http://stackoverflow.com/questions/13786607/normalization-in-dom- parsing-with-java-how-does-it-work doc.getDocumentElement().normalize(); Element root = doc.getDocumentElement(); indexerData = new IndexerData(root);

4. getChildElements (not needed if you only use getElementsbyTagName(String)) public static ArrayList getChildElements(Node node) { ArrayList result = new ArrayList (); NodeList children = node.getChildNodes(); for(int i = 0; i < children.getLength(); i++) { Node child = children.item(i); if(child.getNodeType() == Node.ELEMENT_NODE){ result.add((Element)child); } return result; }

5. getValue public static String getValue(Element element) { String result = ""; Node child = element.getFirstChild(); result = child.getNodeValue(); return result; }

6. The Class IndexerData //An Example of how to use “DataImporter.getChildElements(Element) public class IndexerData { private ArrayList users = new ArrayList (); private ArrayList projects = new ArrayList (); public IndexerData(Element root) { ArrayList rootElements = DataImporter.getChildElements(root); ArrayList userElements = DataImporter.getChildElements(rootElements.get(0)); for(Element userElement : userElements) { users.add(new User(userElement)); } ArrayList projectElements = DataImporter.getChildElements(rootElements.get(1)); for(Element projectElement : projectElements) { projects.add(new Project(projectElement)); }

7. Using “getElementsByTagName” and “DataImporter.getValue(Element), public class Project { private String title = null; private int recordsPerImage = -1; private int firstYCoord = -1; private int recordHeight = -1; ArrayList fields = new ArrayList (); ArrayList images = new ArrayList (); public Project(Element projectElement) { title = DataImporter.getValue((Element)projectElement.getElementsByTagName("title").item(0)); recordsPerImage = Integer.parseInt(DataImporter.getValue( (Element)projectElement.getElementsByTagName("recordsperimage").item(0))); firstYCoord = Integer.parseInt(DataImporter.getValue( (Element)projectElement.getElementsByTagName("firstycoord").item(0))); recordHeight = Integer.parseInt(DataImporter.getValue( (Element)projectElement.getElementsByTagName("recordheight").item(0))); Element fieldsElement = (Element)projectElement.getElementsByTagName("fields").item(0); NodeList fieldElements = fieldsElement.getElementsByTagName("field"); for(int i = 0; i < fieldElements.getLength(); i++) { fields.add(new Field((Element)fieldElements.item(i))); } Element imagesElement = (Element)projectElement.getElementsByTagName("images").item(0); NodeList imageElements = imagesElement.getElementsByTagName("image"); for(int i = 0; i < imageElements.getLength(); i++) { images.add(new Image((Element)imageElements.item(i))); }